The Carn Brea hill has site encircling stone walls constructed about six thousand years ago. A series of large stone walls encircle the central and eastern tors of the hill, with a double set of ramparts built across the slopes which links both and encloses the area between them. Excavations in point to them dating to the Early Neolithic period of between 4,000 and 3,500 BC. Archaeological digs in the interior of the eastern enclosure uncovered remains of rectangular lean-to houses against the internal face of the ramparts. Flint arrow heads found around the main entrance to the enclosure indicated that the site had been attacked by warriors with evidence that the houses had been burned down, pointing to a period of tribal warfare.